'''
(1) 数字
'''
a = 1
def foo1(a):
    a = 10
foo1(a)
print(f'a = {a}') # 1
'''
(2) 字符串
'''
b = 'hello'
def foo2(b):
    b = 'world'
foo2(b) 
print(f'b = {b}') # hello
'''
(3) 元组
'''
c = (1,2,3)
def foo3(c):
    c = (4,5,6)
foo3(c)
print(f'c = {c}') # (1, 2, 3)

'''
(1) 列表
'''
a = [1,2,3]
def foo1(a):
    a[0] = 5
    a[1] = 5
    a[2] = 5
foo1(a)
print(f'a = {a}') # a = [5, 5, 5]
'''
(2) 字典
'''
b = {'name':'chen'}
def foo2(b):
    b['name'] = 'zhen'
foo2(b)
print(f'b = {b}') # b = {'name': 'zhen'}
'''
(3) 对象
'''
class User:
    def __init(self):
        self.username = 'chen'
def foo4(user):
    user.username = 'zhen'
u = User()
foo4(u)
print(f'user = {u.username}') # user = zhen